jscc/dist/regexes.js

Tiny and powerful preprocessor for conditional comments and replacement of compile-time variables in text files

"use strict";
/*
  regex list
*/
const _R = require("perf-regexes");
/**
 * Stringified regex to match a valid jscc varname.
 */
const VAR_BASE = /_[0-9A-Z][_0-9A-Z]*/.source;
/**
 * Creates a new regex with a sub-regex for varnames inserted in the holes
 * marked with '@'. Avoid editing all the regexes if the varname spec is
 * cahnged.
 *
 * @param re Regex to transform
 * @param f Regex flags
 */
const mkRe = (re, f) => RegExp(re.source.replace(/@/g, VAR_BASE), f || '');
/**
 * Resulting regexes and templates.
 */
const R = {
    /**
     * Matches a valid jscc varname.
     */
    VARNAME: mkRe(/^@$/),
    /**
     * Matches jscc var assignments in the format "_VAR=expr" of jscc directives.
     *
     * - $1: varname
     * - $2: rest of the line, including value and comment, excluding '='
     */
    ASSIGNMENT: mkRe(/^\s*(@)\s*=?(.*)/),
    /**
     * Regex source to search varnames in jscc expressions (without the '$').
     *
     * __NOTE:__
     *
     * This template allows the varname to be followed by any char that is not
     * not part of another jscc varname or JS variable name. Because this, it
     * supports properties (ex: `_VAR.prop` or `_VAR['prop']`) to be evaluated
     * by the `evalExpr` function.
     *
     * - $1: char preceding the varname, not in the set [$\w.]
     * - $2: varname
     */
    S_VARNAMES: mkRe(/(^|[^$\w.])(@)(?=[^$0-9a-z]|$)/).source,
    /**
     * Matches varnames in the format "$_VAR", followed by zero or more
     * properties with dot notation _inside_ the code already processed.
     *
     * - $1: var name
     * - $2: optional expression
     *
     * __NOTE:__
     *
     * This regex allows concatenation of varnames, like in `$_VAR1$_VAR2`
     *
     * Code supporting macro replacement was removed in v1.0. It still needed more
     * work to skip nested braces, strings, regexes, ES6 TLS... and I'm not sure
     * if this feature is necessary, cannot find a valid use case to keep it.
     */
    VARS_TO_REPL: mkRe(/(?:(\$@)((?:\.\w+)+)*)(?=\W|$)/, 'g'),
    /**
     * Template to create regexes that match single and double quoted strings.
     *
     * Takes care of embedded (escaped) quotes and EOLs of multiline strings.
     *
     * It has no captures.
     */
    S_STRINGS: _R.JS_STRING.source,
};
module.exports = R;
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